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Grey's Anatomy Spoilers: It is Not a Tumor?

The addition of sexy, mysterious new intern Sadie (Melissa George, right) has piqued the curiosity of Grey's Anatomy fans as her rumored future love interests - Mark, Callie, even Meredith - are wide-ranging. Well, what's next for her might surprise you.

Meanwhile, Izzie Stevens (Katherine Heigl, left) is definitely seeing dead people, as Denny (Jeffrey Dean Morgan) is signed on for at least five episodes. But it may not be the widely-speculated brain tumor that's bringing on Izzie's visions of him.